Table 2
Column densities (in cm-2) and column density ratios.
| N(HCCO) | N(H2CCO) | N(HCO) | |||||||
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|
|
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| Source | N(H2) Ref | N(HCCO) | N(H2) | N(H2CCO) | N(HCCO) | N(CH3CHO) | N(HCO) | N(H2) | N(CH2CHCH3) |
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| Lupus-1A | 1.5 × 1022 (1) | 5.4 × 1011 | 3.6 × 10-11 | 4.3 × 1012 | 8 | 2.3 × 1012 | 2.5 × 1012 | 1.7 × 10-10 | 2.6 × 1013 |
| L483 | 3.0 × 1022 (2) | 4.3 × 1011 | 1.4 × 10-11 | 4.4 × 1012 | 10 | 3.2 × 1012 | 2.7 × 1012 | 9.0 × 10-11 | < 1.0 × 1013 |
| L1495B | 1.2 × 1022 (3) | < 1.3 × 1011 | < 1.1 × 10-11 | 2.2 × 1012 | > 17 | 5.8 × 1011 | 6.7 × 1011 | 5.6 × 10-11 | 2.8 × 1013 |
| L1521F | 1.35 × 1023 (4) | < 1.0 × 1011 | < 7.4 × 10-13 | 2.8 × 1012 | > 28 | 7.9 × 1011 | 1.7 × 1012 | 1.3 × 10-11 | 1.9 × 1013 |
| Serpens South 1a | 2.0 × 1022 (5) | < 1.7 × 1011 | < 8.5 × 10-12 | 3.9 × 1012 | > 23 | 1.0 × 1012 | 1.6 × 1012 | 8.0 × 10-11 | 4.2 × 1013 |
| L1389 | 1.0 × 1023 (6) | – | – | – | – | – | 2.0 × 1012 | 2.0 × 10-11 | – |
| L1172 | 6.0 × 1021 (7) | – | – | – | – | – | 6.3 × 1011 | 1.1 × 10-10 | – |
| L1251A | 5.1 × 1021 (8) | – | – | – | – | – | 6.0 × 1011 | 1.2 × 10-10 | – |
| L1512 | 5.7 × 1021 (3) | – | – | – | – | – | 4.6 × 1011 | 8.1 × 10-11 | – |
Notes. Upper limits are given at 3σ confidence. A blank value indicates that observations were not sensitive enough.
Reference. (1) This study; (2) Tafalla et al. (2000); (3) Myers et al. (1983); (4) Crapsi et al. (2005); (5) Friesen et al. (2013); (6) Launhardt et al. (2010); (7) quoted by Cordiner et al. (2013); (8) Sato et al. (1994).
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